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| 1935 year. | Detailed full catalog for 1936 year. | 1937 year. |
| BC number(s): 313, 314, 315, 316, 317, 318, 319, 320, 321, 322, 323, 324, " Regular. 1936 " - twelve postage stamps. |
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| BC number(s): 325, 326, 327, "IV Congress of Slavic Geographers and Ethnographers, Sofia. " - three postage stamps. |
| 1935 year. | Detailed full catalog for 1936 year. | 1937 year. |
